@edisonljh I guess you missed `ecc_handle.open()` after opening it. Please see
my patch below:
```diff
+ let mut ecc_handle = SgxEccHandle::new();
+ let _ = ecc_handle.open(); // <-- here
+ println!("attempting to create keypair");
+ let mut private = sgx_ec256_private_t::default();
+ let mut public = sgx_ec256_public_t::default();
```
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